Parallelogram for drafting.



F. H. KOHLBR.

PARALLBLOGRAM FOR DRAFTING.

APPLIOATION FILED SEPT. 20, 1912.

1,057,852. Patented Apr. 1, 1913.

3 SHEETS-SHEET 1.

C I N auue ntoz will /2. Kai/e1.

F. H. KOHLER.

PARALLELOGRAM FOR DRAFTING.

APPLICATION FILED SEPT,20,1912.

1,057,852. Patented Apr. 1,1913.

3 SHEETS-SHEET 2 M41 EMA-1W1 3 n uento'o I. .H. KOHLER.

PARALLBLOGEAM FOB. DRAFTING.

APPLICATION I'ILED snPT.2o,1912.

1,057,852. Patented Apr. 1,1913.

3 SHEETS-SHEET 3.

I *wamxmm I 7 wi tmcooao Drafting,

rm]: H. 1:01am; or Tacoma, wasmnoron.

PARA LELOGRAM FOR DRAFTING.

Specification of Letters Patent. I

Patented A r. 1, 1913.

I Application filed September 90, 1912. Serial No; 721,439.

To all whom it may concern:

Be it'known that I, FRANK H. KoHLnR, a citizen of the United States, residing at Tacoma, in the county of Pierce and State of Washington, have invented new and useful Improvements in Parallelogr'ams for of which the following is a specific'ation.

My" invention relates to drafting instruments and in particular to a device adapted to be attached to a drawing board and to a triangle for use in connection therewith so as to connect the same together and to maintain the triangle in the same angular relation to the said drawing board throughout movement of the former upon the board.

The primary object of the invention is to provide an attachment of'the class described which is adapted to be secured to the drawing board at some initial, angular relation thereto, and to have an ordinary triangle secured to its movable head at the desired angle to the drawing board and so that it may be readily attached thereto, the triangle after bein angularly adjusted and fixed in this position being adapted to maintain the same angular relation to the drawing board during movement of the said head over the board.

The invention consists of the features of construction, combination and arrangement of parts, hereinafter fully described and claimed, reference being bad to the accompanying drawings, in which difi'erent adjusted p Figure 1 is a plan view of the attachment alone. Fig. 2 is a plan view of the attachment secured to a drawing board, and having a triangle secured in position upon the movable head, the dotted lines showing the triangle adjusted angularly. Fig. 3 is a similar view showing the movable head in a osition. Fig. 4 is a plan view of the move. 1e head and triangle attached thereto showing measuring scales attached to the triangle. Fig. 5 is a front elevation of the movable head as shown in Fig.4. Fig. 6 is a sectional view taken on the line 6-6 of Fig. 2. Fig. 7 is a transverse sectional view taken through the elhow annulus. Fig. 8 is a transverse sectional view taken through the base.

-- "Referring to the drawings, the component arts of the device may be generally designated as the base A, the elbow B, the

.are

swinging arms C and D, and the movable head The base A comprises a flat attachingplate 1 which is adapted to be secured to the drawing board by means of suitable screws or thumb tacks 2, and the adjustable plate 3. The plate 3 is pivotally secured to the upper surface of the attaching plate 1 by means of the pintle 4, and is provided with an arcuate slot 5 concentric with the pintle 4 adapted to receive a clamping bolt 6 provided with a knurled nut 6 earned by the plate 1 so that the adjustable plate 3 may be locked in difl'erentangular relations 7 link members 14 and 15 whose inner ends ivotally secured to the under surface of t e annulus. 11 at pointsdiametrically opposite each other and separated by an angle of 90 from the pivot points of the link members 7 and 8, by means of the pivot pins'1'6 and 17, respectively.

In the construction of the movable head, a semi-circular plate 18' is attached to the end of arm D, the extremities of the link members 14 and 15 being pivotally connected thereto by means of the ivot pins 19 and 20, respectively. An attac in member 21 constructed preferably of'woo or some such material is secured pivotally to the plate 18 by means of a bolt 22 provided with a longitudinally extending threaded recess 23 communicating with its upper end, 'the upper end of said bolts extending past the upper face of the plate 18, this projecting portion being recelved within an o enlng in a rotractor 24. A screw mem er 25 provi ed with a threaded reduced portion 26 and a head 27 is adapted to have the threaded portion 26 screwed into the recess within the member 22 so that the head 27 thereof engages the upper face of the pro tractor 24 so as to clamp the said protractor nect oth members with the her 21. I ,s a and the protraotor ggt when timing-m m. A tr fli- The .plate 18 p p in the position 'ust describedihavetheir rounded edges 5 ightly 'spacedrsfrom. each protruding upper end of the bolt 80.' An

arcuate bar 83 is attached to the'upper surface of the attaching trianglea'djacent the right angular corner-thereo and is ada ted to have its inner concave face 84 in ic-' tienal enga emcnt with the outer convex face 35 of tie rotractor? Thisbar83 is centrally rovi ed with=an indicatorpoint 30 ndapte to'overliethe ledge 87" rovided by the outer edge of'the plate 18 t e-up'per face of the said'pointerlying int e lane 'of the upper face of the pr'otractorfjeattachin triangle member is 'adaptedto be secure to an ordina drawingntt'ihnglefBS composed of 'celluloi erflseme'suehn-ansparent material, by means of a plurali of attaching bolts 39 arranged along therightangular, base 'arms of the-said trian e and preferably adj acent the ends 'thereo sees not to form an obstruction to the'link menrbers of the arm D upon angular adjustment of the triangle with respec to the movable head E. A spring clip 40 has its inner end secured to one of'the-attaqhing bolts 80 and has its outer portion curve "downwardly and then upwardly to its end as shown at 41. The spring clips arranged along either side of'the triangleare adapted-to enga the upper face of a scale .42 of-fsuitab e length to hold the same in" osition -a inst the upper face ofthe said t ahgle'so t at its outer edge lies in the plane oft 'e outer ed of the trianglcythe said; scale adapted'te'; used in measuring while the-triangle is'being uscdfor the usual urpose." 1 I twill bescen that -have'provideda'de vice of the class described which is adapted to be readily attached to an drawin board so-that'the movahle headj slwdapt -to be chan ed in position-pa the face etzthe said heart ,the tuna le itself-ado tedto'be'angularly adjuste with'respec "tothl'movable head, I and the attachment "fr-whole adapted to be an larly fadjusted" with respect totheattac 'ing'ibaseaf-f 'l hiea-eon structionfren'dersthetdevlcei bapable 61%,!!! N raving triangleattached to the un er'face and late is ae'geular as ioi pisotsuy an."

MOW i3 ii'ioiiti'iniinute ,adjustments-and adapted to stave its .purpos'e'etliciently and accurately ,when'in use.

' Wbat isclaimed is:

' "1; A 'device of the class described comprising a base, an annulus, an arm includ- -ing parallel link members operatively connecting-said annulus with the base, a mov able head comprising a semi-circular plate, a secondarm including parallel link mem- .be'rs operatively connecting said plate with j the annulus an attaching member pivotally 'connectedtosaid'plate and being ang'ularly udjustable'with respect thereto and means "1 ter lockin' said member in different adlasted-"positions, said attaching member 1 adaptedto have a drawing triangle secured t thereto.

; '2. A device of the class described com- 't'ising a base, an elbow annulus, an arm including link members operntively con- 1 nesting said annulus with the base, a seeond arm including parallel link members connected to said annulus, a movable head 5 consisting of a semi-circular plate opera- 5 tively-connected to said second arm, an attaching member adjustably secured to said plate, means for securing a drawing trian- *gle to said attaching member, and means 1 carried'by said securing means adapted to a hold ameasuring scale againstthe up er Piece-of aid drawing triangle in suitaile 'proximit to either free edge thereof.

8*. A cries of the class described comprising-a base, an elbow annulus, an arm ineludin link members operatively connectin'gqsaidj annulus with the base, a second arm includin parallel link members connected to sai annulus, a movable head in cluding a semi-circular plate operatively connected to'said'second arm, an'atta'ching member pivoted to said late, means for securing'sai'd member in smitionswith relation to the said late, a rawmg triangle'attached to the unier face of said attaching" member, and a plurality ofs rm jclips'secured to the upper face 0ft 0 a taching member adjacent the side edges thereof and adapted to overlie the projecting free portions of the triangle for securmg measurin scales in position afiainst'f'the 'triang e at the free edges t ere'of.

itlerent adjusted of said attaching member, and a plurality of spring clips pivotally connected to said attaching member adjacent the free edges thereof and adapted to be swung into outwardly projectin osition so as to overlie the free edges 0 t e said triangle for attaching measuring scales thereto. '5. A device of the class described comprisin a base, an elbow annulus, an arm including link members operatively connecting said annulus with the base, a second arm including parallel link members connected to said annulus, a movable head includin a semi-circular plate operatively connecte to said second arm, an attaching member pivotally connected to said plate against the under face thereof and adapted to have a drawing triangle secured thereto,

a protractor secured to the upper face ofsaid plate concentric withrespect to the attaching member pivot, an indicator bar carried by the attaching member and having an indic'ator point oppositely associated with the said protractor, and means for adjusting said attaching member angularly with recured to said plate, said member being trir angular in shape, w' draavling triangle secured to the under face of said attaching member with its edges parallel to the edges of the said member, and means for securing a measuring scale upon theulpper face of said drawing triangle against each free edge of the attaching member.

In testimony whereof I afiix my signature in presence of two witnesses.

FRANK H. KOHLERI Witnesses WALTER A. KOHLER, GEORGE C. FLEEMAN. 

